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                [Tjoi2016&Heoi2016]树                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>在2016年，佳媛姐姐刚刚学习了树，非常开心。现在他想解决这样一个问题：给定一颗有根树（根为1），有以下</div>
<div>两种操作：1. 标记操作：对某个结点打上标记（在最开始，只有结点1有标记，其他结点均无标记，而且对于某个</div>
<div>结点，可以打多次标记。）2. 询问操作：询问某个结点最近的一个打了标记的祖先（这个结点本身也算自己的祖</div>
<div>先）你能帮帮他吗?</div></p><hr/><h3>输入格式</h3><p><div>
<div>输入第一行两个正整数N和Q分别表示节点个数和操作次数接下来N-1行，每行两个正整数u,v(1&le;u,v&le;n)表示u到v</div>
<div>有一条有向边接下来Q行，形如&ldquo;opernum&rdquo;oper为&ldquo;C&rdquo;时表示这是一个标记操作,oper为&ldquo;Q&rdquo;时表示这是一个询</div>
<div>问操作对于每次询问操作，1 &le; N, Q &le; 100000。</div>
</div></p><hr/><h3>输出格式</h3><p><p>输出一个正整数，表示结果</p></p><hr/><h3>样例输入</h3><pre>5 5
1 2
1 3
2 4
2 5
Q 2
C 2
Q 2
Q 5
Q 3</pre><hr/><h3>样例输出</h3><pre>1 
2 
2 
1</pre><hr/><h3>提示</h3><p><p>&nbsp;新加数据9组(By&nbsp;<span style="font-family: Arial; font-size: 14px; line-height: 15.8666658401489px;">HFLSyzx</span>&nbsp;),未重测--2016.8.2</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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